I've only one Savinelli, an unfinished, with less than perfect drilling, a bent dublin/oom paul. The drilling isn't too terribly off center, and it still smokes descent when paired with the right tobacco. It is not stamped Savinelli, but it is stamped with the shield and S. My guess is these were barely spared rejection and sold dirt cheap basically to pay for the price of materials. This pipe is small and very light and hangs from the jaw easily, and is one of the few pipes I'll clench. It's not one of my favorite pipes, however I don't hate it either. It has a spot in my rotation and gets smoked from time to time. But it is my only Sav and an inexpensive one so I personally cannot give a solid opinion on whether Savs or Petes are best.
I have three Petersons, all XL90s, all Saint Patrick's Day pipes from the last three years. So these are all pretty inexpensive pipes as pipes go as well. They are all, however, very nice looking pipes. I don't clench them often, as they're pretty substantial (although I have bigger pipes) but I love the way the XL90 shape fits in the hand. Last years St. Patty is drilled a bit off and will not pass a pipe cleaner. But it seems to smoke pretty good regardless. I don't smoke it as often as some of my other pipes, but I still like it. The 2013 is an amazing pipe. I do have to give a slight twist to get that pipe cleaner through to the bowl, but it's drilled center and is my best smoker. In fact it smoked wonderfully from the beginning when I was still a very green pipe smoker with much to learn. My latest, the 2015 St. Patty (the most beautiful of the St Patty pipes yet in my opinion smoked like a dream at very first light, may be a contender for best smoker if it hasn't beat out the 2013 yet... I might just not want to take away that trophy from my first one, and the pipe cleaner passes from bit to bowl like a hot knife through butter. That is not an exaggeration. I actually posted my first ever review at a retailer on this pipe at Pipesandcigars.com which they posted here... http://www.pipesandcigars.com/pipes/90168/peterson-st-patricks-day-2015/
To say I'm pleased with the pipe is an understatement.
But you say... "That's only three Petes! And one is less than perfect!" I know. And I agree. I can't rightfully compare the two companies. But mine all smoke descent to great and look great too. And the Sav is a reject, but is a descent smoker in its own right as well. I will however definitely be ordering another Peterson soon. I'm trying to get my hands on a Walnut Spigot XL90. This will be the last of that shape I get until I've had a chance to try a few other shapes... unless next years St. Patty's Day comes around first. The XL90 will always be my tradition for that. I have also seen quite a few Savs I would like to order. But their time will come. I haven't the funds to buy pipes as often as others and the pipe must really catch my eye. When I have the funds, I really have to pick and choose, and try to make up my mind between one or another. Sometimes, in fact most of the time, a great pipe I'd love to buy never gets purchased.
I can only speak on my experiences so far, and I think I've done that. A bit long winded, I'm sure. So this is where I leave the comparisons to more of you. Try to make up my mind for me whether my next pipe after the spigot will be another Pete or a Sav. :D